Dropbox - Online Sync and File Sharing
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Google Drive - Access and sync your files anywhere
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Microsoft OneDrive - Secure access, sharing & file storage
Basecamp - A simple and elegant project management system.